In conclusion, it may be said that the lesion described consists of a selective impregnation of the elastic tissue in the splenic trabeculae and vessels with the phosphates-and perhaps other salts-of calcium and iron. There is a further chemical change in the elastic fibers which may be expressed by the term "elacin." Degenerated and, especially, calcified elastic tissue-even more than calcific...

The addition of additives (electrolytes, trace elements, and vitamins) to parenteral nutrition (PN) mixtures can lead to precipitation as a result of physical incompatibilities and can lead to chemical degradation of individual ingredients. The most significant cause of precipitation is excessive concentrations of calcium phosphate. The most significant cause of chemical instability is the oxid...

The precipitation of the phosphates, oxalates, and carbonates of calcium is complicated by the possible formation of different precursor phases involving polymorphs, hydrates, and acid salts. In order to elucidate the mechanisms of the reactions, it is necessary to study the kinetics under conditions of controlled supersaturation calculated from the activities of free ionic species. In general,...

The substitution of secondary propargylic phosphates ROP(O)(OEt)2 where R = [Ph(CH2)2]C(H)(C≡CTMS)] Ph(CH2)2CH(OP(O)(OEt)2)(C≡CTMS) with copper reagents derived from PhLi and salts such as CuCl, CuCN, Cu(acac)2 was studied to establish an ArLi-based reagent system. Among the prepared, PhLi/CuCl (2:1) showed 98% α regioselectivity (rs), while PhLi/Cu(acac)2 γ selective (>99% rs). prepared in ...

The article is devoted to the study of ecological and hydrochemical parameters rivers Volga Dubna within city, Moscow region, while considering both actual indicators, as well biochemical ecotoxicological characteristics watercourses. It shown that watercourses are constantly subjected anthropogenic pressure. inevitably leads arrival a number pollutants including heavy metals can destroy existi...

Reagent grade chemicals were used where available. Adenosine triphosphate and coenzyme A were obtained from the Pabst Laboratories; riboflavin-5'-phosphate was obtained from the California Foundation for Biochemical Research; sugar phosphates were obtained from Nutritional Biochemicals Corporation. "Levigated Alumina," A-542, from Fisher Scientific Company, was used in preparing ground-cell sus...